central meridian

central meridian

The imaginary N–S line bisecting the disk of a planet, satellite, etc., used as a reference.

central meridian

[′sen·trəl mə′rid·ē·ən]
(astronomy)
The meridian of a planet that crosses the center of the visible face of the planet at a given instant.

central meridian

central meridian
The longitudinal line of symmetry of a map projection and, generally, a baseline for referencing the projection to the associated grid coordinate system. As such, grid north and true north are coincident along the central meridian, but at any other point of the projection, grid north and true north diverge as a function of geodetic latitude and longitudinal distance from the central meridian as a result of the convergence of the meridians. Most map projections portray meridian convergence, but one notable exception is the Mercator Projection.
References in periodicals archive ?
And here are the times, in Universal Time, when the Great Red Spot should cross Jupiter's central meridian.
Once the longitude of the central meridian has been established you can easily work out the longitude of groups on the disk by adding degrees for those west of the meridian and subtracting degrees east of the meridian.
Note that the value of N here is the North ordinate from the origin which is the intersection of the Central Meridian and the Equator, and the False Northing therefore needs to be added in later.
In what is thought to be the first example of a distributor offering free training for staff in its fascia stores, AF Blakemore & Son's Guild Academy provides business development training for Spar retailers across its Central Meridian Guild area.
It recommended more green spaces, a central meridian on Lankershim, and more and smaller parking structures and - hold on a minute, here - smaller parking structures?
In the summer of 1997, amidst the devolution of Scotland and Wales and the death of Diana, geographer and award-winning writer, Nicholas Crane, equipped himself with a camouflaged umbrella and embarked on a remarkable walk straight along England's central meridian.
Because I was walking along a route I didn't choose - there's only one central meridian - I came across places I'd never heard of.
31, 1996--All features and functions of the Meridian Series 2000 Digital Deskset can now be cost-effectively extended from a central Meridian PBX to remote locations using Coastcom's new MX Series digital phone extender with the D/I MUX III Intelligent Multiplexer.
It takes 50 minutes for a feature to rotate from Jupiter's central meridian halfway to the preceding limb.
AR1043 N25[degrees]/324[degrees] continued across the disk from the previous month, approaching the central meridian on Feb 1 type Hsx with an area of 30 millionths.
The predicted times when the center of the Great Red Spot crosses the central meridian are listed in Sky & Telescope or can be obtained on our web site.
Central Meridian Spar wholesaler AF Blakemore undertook a "root and branch overhaul" of its fresh produce offer last summer, when it was faced with falling sales and disillusioned customers in the 194 Spar outlets in its Tates stores division.

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